diff --git a/package.json b/package.json
index 6ddcf62..b6cca0c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "null-safety",
-  "version": "0.1.2",
+  "version": "1.0.0",
   "description": "null-safety is class which supports accessing to properties null-safety, undefined-safety, type-safety, sequentially.",
   "main": "lib/null-safety.cjs.js",
   "module": "lib/null-safety.mjs.js",